http://book.cakephp.org/2.0/en/models/associations-linking-models-together.html#hasandbelongstomany-habtm

*"unique*: If true (default value) cake will first delete existing 
relationship records in the foreign keys table before inserting new ones, 
when updating a record. So existing associations need to be passed again 
when updating."

Maybe this could be your problem...

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